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1.
J Pediatr Hematol Oncol ; 44(3): e719-e722, 2022 04 01.
Artículo en Inglés | MEDLINE | ID: mdl-34966090

RESUMEN

About 25% of the patients with the translocation t(11;19)(q23;p13.3)/KMT2A-MLLT1 present three-way or more complex fusions, associated with a worse prognosis, suggesting that a particular mechanism creates functional KMT2A fusions for this condition. In this work, we show a cryptic three-way translocation t(9;11;19). Interestingly, long-distance inverse polymerase chain reaction sequencing revealed a KMT2A-MLLT1 and the yet unreported out-of-frame SEC16A-KMT2A fusion, associated with low SEC16A expression and KMT2A overexpression, in an infant with B-acute lymphoblastic leukemia presenting a poor prognosis. Our case illustrates the importance of molecular cytogenetic tests in selecting cases for further investigations, which could open perspectives regarding novel therapeutic approaches for poor prognosis childhood leukemias.


Asunto(s)
Retículo Endoplásmico , Leucemia-Linfoma Linfoblástico de Células Precursoras , Niño , Retículo Endoplásmico/metabolismo , Aparato de Golgi/metabolismo , Humanos , Lactante , Proteína de la Leucemia Mieloide-Linfoide/genética , Proteína de la Leucemia Mieloide-Linfoide/metabolismo , Proteínas de Neoplasias/genética , Proteínas Nucleares/genética , Leucemia-Linfoma Linfoblástico de Células Precursoras/genética , Factores de Transcripción/genética , Translocación Genética , Proteínas de Transporte Vesicular
2.
Breast J ; 27(8): 638-650, 2021 08.
Artículo en Inglés | MEDLINE | ID: mdl-34142409

RESUMEN

Wire-guided localization (WGL) is the standard of care in the surgical treatment of nonpalpable breast tumors. In this study, we compare the use of a new magnetic marker localization (MaMaLoc) technique to WGL in the treatment of early-stage breast cancer patients. Open-label, single-center, randomized controlled trial comparing MaMaLoc (intervention) to WGL (control) in women with early-stage breast cancer. Primary outcome was surgical usability measured using the System Usability Scale (SUS, 0-100 score). Secondary outcomes were patient reported, clinical, and pathological outcomes such as retrieval rate, operative time, resected specimen weight, margin status, and reoperation rate. Thirty-two patients were analyzed in the MaMaLoc group and 35 in the WGL group. Patient and tumor characteristics were comparable between groups. No in situ complications occurred. Retrieval rate was 100% in both groups. Surgical usability was higher for MaMaLoc: 70.2 ± 8.9 vs. 58.1 ± 9.1, p < 0.001. Patients reported higher overall satisfaction with MaMaLoc (median score 5/5) versus WGL (score 4/5), p < 0.001. The use of magnetic marker localization (MaMaLoc) for early-stage breast cancer is effective and has higher surgical usability than standard WGL.


Asunto(s)
Neoplasias de la Mama , Neoplasias de la Mama/diagnóstico por imagen , Neoplasias de la Mama/cirugía , Femenino , Humanos , Fenómenos Magnéticos , Márgenes de Escisión , Mastectomía Segmentaria , Reoperación
3.
Int J Mol Sci ; 22(22)2021 Nov 10.
Artículo en Inglés | MEDLINE | ID: mdl-34830027

RESUMEN

Breast cancer (BC) is a heterogeneous disease composed of multiple subtypes with different molecular characteristics and clinical outcomes. The metastatic process in BC depends on the transcription factors (TFs) related to epithelial-mesenchymal transition (EMT), including the master regulator Twist1. However, its role beyond EMT in BC subtypes remains unclear. Our study aimed to investigate the role of Twist1, beyond EMT, in the molecular subtypes of BC. In patients, we observed the overexpression of TWIST1 in the HER2+ group. The silencing of TWIST1 in HER2+ BC cells resulted in the upregulation of 138 genes and the downregulation of 174 genes compared to control cells in a microarray assay. In silico analysis revealed correlations between Twist1 and important biological processes such as the Th17-mediated immune response, suggesting that Twist1 could be relevant for IL-17 signaling in HER2+ BC. IL-17 signaling was then examined, and it was shown that TWIST1 knockdown caused the downregulation of leading members of IL-17 signaling pathway. Taken together, our findings suggest that Twist1 plays a role on IL-17 signaling in HER2+ BC.


Asunto(s)
Neoplasias de la Mama/inmunología , Regulación Neoplásica de la Expresión Génica/inmunología , Interleucina-17/inmunología , Proteínas Nucleares/inmunología , Receptor ErbB-2/inmunología , Transducción de Señal/inmunología , Proteína 1 Relacionada con Twist/inmunología , Neoplasias de la Mama/genética , Neoplasias de la Mama/patología , Línea Celular Tumoral , Femenino , Humanos , Interleucina-17/genética , Proteínas Nucleares/genética , Receptor ErbB-2/genética , Transducción de Señal/genética , Proteína 1 Relacionada con Twist/genética
4.
Cytogenet Genome Res ; 152(1): 33-37, 2017.
Artículo en Inglés | MEDLINE | ID: mdl-28595195

RESUMEN

Pediatric acute myeloid leukemia (AML) is a highly heterogeneous disease, presenting cytogenetic and molecular abnormalities which turned out to be critical prognostic factors. Ploidy changes as gain or loss of individual chromosomes are rare in AML, occurring only in about 1-2% of the affected children. Hyperdiploid karyotypes are exceedingly rare in infants less than 12 months of age. In this age group, structural rearrangements involving the KMT2A gene occur in about 58% of the cases. Among them, the translocation t(9;11)(p22;q23), KMT2A-MLLT3, is the most common abnormality accounting for approximately 22% of KMT2A rearrangements in infant AML cases. Here, we describe a 7- month-old girl with a history of fever and severe diarrhea, and a physical examination remarkable for pallor and hepatosplenomegaly. A novel complex hyperdiploid karyotype 53,XX,+X,+6,t(9;11)(p21.3;q23.3),+der(9)t(9;11)(p21.3;q23.3),dup(13)(q31q34),+14,+19,+21,+22 was characterized by high-resolution molecular cytogenetic approaches. Fluorescence in situ hybridization, multiplex-FISH, and multicolor chromosome banding were applied, revealing 2 reverse MLLT3-KMT2A fusions and a duplication of the GAS6 oncogene. Our work suggests that molecular cytogenetic studies are crucial for the planning of a proper strategy for risk therapy in AML infants with hyperdiploid karyotypes.


Asunto(s)
Duplicación Cromosómica , Análisis Citogenético/métodos , Diploidia , Péptidos y Proteínas de Señalización Intercelular/genética , Cariotipo , Leucemia Mieloide Aguda/genética , Proteínas Nucleares/genética , Oncogenes , Femenino , Reordenamiento Génico , N-Metiltransferasa de Histona-Lisina/genética , Humanos , Lactante , Proteína de la Leucemia Mieloide-Linfoide/genética , Translocación Genética
6.
Clin Breast Cancer ; 24(1): e31-e39, 2024 01.
Artículo en Inglés | MEDLINE | ID: mdl-37926663

RESUMEN

INTRODUCTION: Intraoperative specimen radiography is a routinely used procedure to ensure adequate resection of non-palpable breast tumors. Intraoperative digital specimen mammography (IDSM) is an alternative to conventional specimen radiography (CSR) which provides immediate specimen evaluation and can potentially decrease operation time. IDSM may also result in lower positive margin and re-excision rates. IDSM was implemented in our hospital in 2018. The objective of this study was to evaluate the effect of using IDSM versus CSR on operation time, margin status and re-excision rates in breast conserving surgery. METHODS: The present study is a single-center retrospective cohort study with 2 patient cohorts: one which underwent CSR (n = 532) and one which underwent IDSM (n = 475). The primary outcome was the operation time. Secondary outcomes were the margin status of the primary surgery, the cavity shaving rate, and the re-excision rate. Differences between cohorts were compared using univariate statistics and multiple regression analyses to adjust for variables that were significantly different between the groups. RESULTS: IDSM use was associated with an 8-minute reduction in surgery time (B = -8.034, 95% CI [-11.6, -4.5]; P < .001). Treatment variables independently associated with the operation time included use of IDSM, type of surgery, and performance of cavity shaving. Cavity shaves were more often performed when IDSM was used (24% for IDSM vs. 14% for CSR, P < .001), while the proportion of negative margin rates (93% for IDSM vs. 96% for CSR, P = .070) was comparable. CONCLUSION: IDSM was associated with a modest reduction in operation time. Surgeons performed more cavity shaves since the introduction of IDSM, but this increase was not reflected by difference in negative margin rates.


Asunto(s)
Neoplasias de la Mama , Carcinoma Ductal de Mama , Humanos , Femenino , Neoplasias de la Mama/diagnóstico por imagen , Neoplasias de la Mama/cirugía , Neoplasias de la Mama/patología , Mastectomía Segmentaria/métodos , Estudios Retrospectivos , Mamografía/métodos , Mama/patología , Reoperación , Márgenes de Escisión , Carcinoma Ductal de Mama/diagnóstico por imagen , Carcinoma Ductal de Mama/cirugía , Carcinoma Ductal de Mama/patología
7.
Br J Radiol ; 96(1147): 20220776, 2023 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-37171394

RESUMEN

OBJECTIVE: Previous studies have shown that vacuum-assisted excision (VAE) is a safe and effective alternative for surgical excision (SE) of benign breast lesions. However, the use of VAE in high-risk lesions is controversial and guidelines are ambiguous. This study describes the impact of the implementation of VAE in terms of management and outcomes compared to a cohort before implementation. METHODS: A single centre retrospective study with two cohorts: 'before' and 'after' implementation of VAE was performed. All patients with a benign or high-risk lesion treated by VAE or SE between 2016 and 2019 were included. Excision, complication, and upgrade rates were compared between both cohorts. Cox regression was used for the evaluation of recurrences and re-excisions. RESULTS: The overall excision rate of all benign and high-risk lesions was comparable in both cohorts (17% vs 16%, p = 0.700). After implementation, benign lesions were significantly more often managed by VAE (101/151, 67%, p < 0.001). Re-excision, recurrence, and complication rates were low and comparable between cohorts (4.3% vs 3.9%, p > 0.999; 3.0 vs 2.0%, p = 0.683; 3.4 vs 6.6%, p = 0.289, respectively). CONCLUSION: SE could safely be replaced by VAE in 58% of patients treated for a benign or high-risk lesion. With this shift in management, the use of operating rooms and general anaesthesia can safely be omitted in this patient group. Further research on high-risk lesions is warranted since our data are exploratory. ADVANCES IN KNOWLEDGE: This study provides supportive data for the use of VAE as a management option for both benign (up to 5 cm) and high-risk lesions. Outcomes on re-excision, recurrence should be confirmed in prospective studies especially in high-risk lesions.


Asunto(s)
Neoplasias de la Mama , Ultrasonografía Intervencional , Humanos , Femenino , Estudios Retrospectivos , Estudios Prospectivos , Vacio , Clorofila , Neoplasias de la Mama/cirugía , Neoplasias de la Mama/patología , Mama/diagnóstico por imagen
8.
J Health Care Finance ; 38(3): 22-39, 2012.
Artículo en Inglés | MEDLINE | ID: mdl-22515042

RESUMEN

This article applies a financial ratio model and a behavioral model of health services use' to examine inner-city hospital closures. We use Medicare Cost Report financial information and demographics to find evidence that hospitals with high debt, less severity of illness, and lower occupancy rates are more likely to close, as expected. We also find that urban hospitals with a high elderly population are more likely to remain open. However, hospitals in our study with a high proportion of Medicare patients and a high minority population are more likely to close. This last finding may have important public policy consequences for access to health care for vulnerable populations, particularly in a recessionary economy under health care reform.


Asunto(s)
Clausura de las Instituciones de Salud/tendencias , Accesibilidad a los Servicios de Salud , Hospitales Urbanos/economía , Hospitales Urbanos/estadística & datos numéricos , Anciano , Grupos Diagnósticos Relacionados , Humanos , Modelos Estadísticos , Estados Unidos
9.
PLoS One ; 17(10): e0275253, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-36282795

RESUMEN

BACKGROUND: Brazil lacks data from syphilis in its border areas. We aimed to describe the spatial and temporal distribution of acquired syphilis (AS), in pregnancy (SP) and congenital syphilis (CS) in Brazilian municipalities in the arches border contexts. METHODS: An ecological, cross-sectional study was conducted from 2010 to 2020. The study was based on the cases of syphilis available in the Notifiable Diseases Information System (SINAN), and on the Primary Health Care Information System. The detection rates of AS and SP, and the incidence of CS were estimated, and the time series was analyzed. Data between the border arches were compared. RESULTS: In 2020, data showed 7,603 cases of AS (detection rate 64.8/100,000 inhabitants), 3,960 cases of SP (detection rate of 21.6/1,000 live births) and 836 cases of CS (incidence of 4.6/1,000 live births) in the border region. Between 2010 and 2020, the mean annual increase of detection rate of SP was 53.4% in Brazil, 48.0% in the border region, 59.6% in the North Arch, 28.8% in the Central and 67.2% in the South. Annual variation on the incidence of CS for the same period was 31.0% in Brazil 38.4% at the border, in the North and South Arcs 18.3% and 65.7% respectively. The Central Arch showed an increase only between 2010 and 2018 (62.7%). A total of 427 (72.6%) municipalities has primary health care coverage ≥ 95% of the population. In 2019, 538 (91.8%) municipalities reported using rapid tests for syphilis, which decreased to 492 (84%) in 2020. In 2019, 441 (75.3%) municipalities reported administering penicillin, and 422 (72%) in 2020. CONCLUSION: Our data show syphilis reman problem at the Brazilian border, rates in pregnant are high. It was observed a reduction in the detection rates, SP and the incidence of CS between 2018 and 2020. Syphilis should be included on the agenda of all management levels, aiming at expanding access and quality care.


Asunto(s)
Complicaciones Infecciosas del Embarazo , Sífilis Congénita , Sífilis , Embarazo , Femenino , Humanos , Sífilis Congénita/epidemiología , Brasil/epidemiología , Sífilis/epidemiología , Estudios Transversales , Complicaciones Infecciosas del Embarazo/epidemiología , Incidencia , Penicilinas
10.
Br J Radiol ; 95(1136): 20220117, 2022 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-35604725

RESUMEN

OBJECTIVES: Although vacuum-assisted excision (VAE) is a safe and effective alternative to surgical excision (SE), the latter is most commonly used for the management of benign and high-risk breast lesions. To evaluate the healthcare benefit of VAE, hospital costs and cosmetic outcome after VAE were compared to SE. Additionally, the impact of VAE implementation on hospital costs was investigated. METHODS: This was a single-centre retrospective cohort study with two cohorts: "VAE" and "SE". All patients with a benign or high-risk lesion excised by VAE or SE from January 2016 up to December 2019 were included. Cosmetic outcome was measured with the BCTOS-cosmetic subscale, and hospital costs were presented as mean (SD) and median (IQR). RESULTS: During the study period, 258 patients with 295 excised lesions were included. The initial procedure was VAE in 102 patients and SE in 156 patients. Hospital costs after (median € 2324) were significantly lower than before (median € 3,144) implementation of VAE (mean difference € 1,004, p < 0.001), most likely attributable to the lower costs for patients treated with VAE (mean difference € 1,979, p < 0.001). Mean cosmetic outcome was comparable between VAE (median 1.35) and SE (median 1.44, p = 0.802). CONCLUSIONS: Implementing VAE as an alternative treatment option for benign and high-risk breast lesions resulted in a large decrease in hospital costs but a cosmetic benefit of VAE could not be demonstrated in this retrospective study. ADVANCES IN KNOWLEDGE: Costs associated with the complete patient pathway were included and not only VAE was compared to SE but also the before cohort was compared to the after cohort to demonstrate the benefit of VAE implementation in clinical practice. Additionally, cosmetic outcome was compared between VAE and SE using patient reported outcome measures.


Asunto(s)
Neoplasias de la Mama , Costos de Hospital , Mama/patología , Neoplasias de la Mama/patología , Neoplasias de la Mama/cirugía , Femenino , Humanos , Medición de Resultados Informados por el Paciente , Estudios Retrospectivos , Vacio
11.
Clin Breast Cancer ; 21(6): e715-e730, 2021 12.
Artículo en Inglés | MEDLINE | ID: mdl-33840627

RESUMEN

Women with early-stage breast cancer have an excellent prognosis with current therapy, but could presumably be treated less invasively, without the need for surgery. The primary goal of this meta-analysis was to examine whether thermal ablation is an effective method to treat early-stage breast cancer. Studies reporting on complete ablation rate after thermal ablation as a treatment of small breast cancers (≤ 2 cm) were included. Methodologic quality of included studies was assessed using MINORS criteria. Complete ablation rates are given as proportions, and meta-regression and subgroup analyses were performed. The overall complete ablation rate in 1266 patients was 86% and was highest after radiofrequency ablation (RFA) (92%). Local recurrence rates varied from 0% to 3%, with a median follow-up of 15 to 61 months. Overall, complication rates were low (5%-18% across techniques) and were highest after high-intensity focused ultrasound ablation and lowest after cryoablation. Cosmetic outcome was good to excellent in at least 85% of patients but was reported infrequently and long-term results of cosmetic outcome after thermal ablation and radiotherapy are still lacking. Thermal ablation techniques treating early-stage breast cancer (≤ 2 cm) are safe and effective based on complete ablation rate and short-term local recurrence rates. Especially, RFA, microwave ablation, and cryoablation are promising techniques as an alternative to surgical resection without jeopardizing current treatment effectiveness or safety. Owing to great heterogeneity in the included studies, a formal recommendation on the best technique is not possible. These findings warrant the design of large randomized controlled trials comparing thermal ablation and breast-conserving surgery in the treatment of T1 breast cancer.


Asunto(s)
Neoplasias de la Mama/cirugía , Ablación por Catéter/métodos , Ultrasonido Enfocado de Alta Intensidad de Ablación/métodos , Procedimientos Quirúrgicos Mínimamente Invasivos/métodos , Adulto , Neoplasias de la Mama/patología , Femenino , Humanos , Mastectomía Segmentaria/métodos , Persona de Mediana Edad , Resultado del Tratamiento
12.
BMJ Open ; 11(9): e052992, 2021 09 06.
Artículo en Inglés | MEDLINE | ID: mdl-34489297

RESUMEN

INTRODUCTION: Breast cancer is the most frequently diagnosed malignancy worldwide but almost half of the patients have an excellent prognosis with a 5-year survival rate of 98%-99%. These patients could potentially be treated with thermal ablation to avoid surgical excision, reduce treatment-related morbidity and increase patients' quality of life without jeopardising treatment effectiveness. Previous studies showed highest complete ablation rates for radiofrequency, microwave and cryoablation. However, due to heterogeneity among studies, it is unknown which of these three techniques should be selected for a phase 3 comparative study. METHODS AND ANALYSIS: The aim of this phase 2 screening trial is to determine the efficacy rate of radiofrequency, microwave and cryoablation with the intention to select one treatment for further testing in a phase 3 trial. Additionally, exploratory data are obtained for the phase 3 trial. The design is a multicentre open-label randomised phase 2 screening trial. Patients with unifocal, invasive breast cancer with a maximum diameter of 2 cm without lymph node or distant metastases are included. Triple negative, Bloom-Richardson grade 3 tumours and patients with an indication for neoadjuvant chemotherapy will be excluded. Included patients will be allocated to receive one of the three thermal ablation techniques. Three months later surgical excision will be performed to determine the efficacy of thermal ablation. Treatment efficacy in terms of complete ablation rate will be assessed with CK 8/18 and H&E staining. Secondary outcomes include feasibility of the techniques in an outpatient setting, accuracy of MRI for complete ablation, patient satisfaction, adverse events, side effects, cosmetic outcome, system usability and immune response. ETHICS AND DISSEMINATION: This study protocol was approved by Medical Research Ethics Committee of the Erasmus Medical Center, Rotterdam, the Netherlands. Study results will be submitted for publication in peer-reviewed journals. TRIAL REGISTRATION NUMBER: NL9205 (www.trialregister.nl); Pre-results.


Asunto(s)
Neoplasias de la Mama , Neoplasias de la Mama/cirugía , Detección Precoz del Cáncer , Femenino , Humanos , Terapia Neoadyuvante , Calidad de Vida , Resultado del Tratamiento
14.
Phys Med Biol ; 65(8): 085001, 2020 04 17.
Artículo en Inglés | MEDLINE | ID: mdl-32126542

RESUMEN

Brachytherapy accelerated partial breast irradiation (APBI) is well tolerated, but reported acute toxicities including moist desquamation rates range from 7% to 39%. Moist desquamation is correlated to long-term skin toxicity and high skin dose is the main risk factor. This study uses radiochromic films for in vivo skin dosimetry of low dose rate (LDR) APBI brachytherapy and prediction of skin toxicity. Patients participating in a clinical trial assessing skin toxicity of LDR seed brachytherapy were included in this study. Following the seed implantation procedure, patients were asked to wear a customized oval shaped radiochromic film on the skin projection of the planned target volume (PTV) for 24 h. Exposed films were collected, and maximum point doses were measured. In addition, maximum doses to a small skin volume (D0.2cc) were calculated on the pre- and post-implant CT-scan. Acute skin toxicities (redness, pigmentation, induration and dermatitis) were scored by the treating physician for 2 months during follow-up visits. Skin dose measurements and acute toxicity were available for 18 consecutive patients. The post-implant calculated maximum skin doses (D0.2cc), 60.8 Gy (SD ± 41.0), were on average 30% higher than those measured in vivo (Dmax-film), 46.6 Gy (SD ± 19.3), but those values were highly significantly correlated (Spearman's rho 0.827, p < 0.001). Also, dermatitis and induration were significantly correlated with higher in vivo measured and post-implant calculated skin dose. Pre-implant dosimetry was not correlated with measured or post-implant skin dose or side effects. Radiochromic films can reliably diagnose excess dose to the skin during the first 24 h and predict skin toxicity, which enables preventative measures. Trial registration: Nederlands Trial Register (www.trialregister.nl), NTR6549, the trial was registered prospectively on 27 June 2017. ABR number: NL56210.078.16.


Asunto(s)
Braquiterapia/efectos adversos , Neoplasias de la Mama/radioterapia , Dosimetría por Película , Piel/efectos de la radiación , Adulto , Femenino , Humanos , Persona de Mediana Edad , Dosificación Radioterapéutica , Medición de Riesgo
15.
Br J Radiol ; 93(1114): 20190994, 2020 Oct 01.
Artículo en Inglés | MEDLINE | ID: mdl-32649240

RESUMEN

OBJECTIVE: Better cosmetic outcome after vacuum assisted excision (VAE) compared to surgical excision of benign breast lesions is suggested in previous studies but has never been evaluated with validated outcome measures. In this study, patient reported cosmetic outcome after VAE was evaluated. METHODS: Patients who underwent VAE between July 2017 and December 2018 were invited to complete the cosmetic subscale of the Dutch Breast Cancer Treatment Outcome Scale, comparing the treated with the untreated breast. Response mode ranged from 1 (no difference) to 4 (large difference) and cosmetic outcome was calculated as the unweighted mean. Clinical outcomes included: tumor size, number of cores, complications, residual lesions and recurrences. RESULTS: Response rate was 73.4% (47 of 64 patients). Median tumor size was 15 mm (range 5-51 mm) and median number of cores 6.5 (range 1-85), complete excision was confirmed in all but two patients. Mean cosmetic outcome was good (mean score ≤1.75) in 74% of patients and no patients reported a poor cosmetic outcome (mean score >3.25). A hematoma occurred in five patients (one needed aspiration) and a skin rash in one patient, no patients developed an infection or seroma. CONCLUSION: In this study VAE is safe and effective for tumors up to 5 cm and patient reported cosmetic outcome was good. Patients with benign lesions could benefit from VAE as an alternative for surgical excision. ADVANCES IN KNOWLEDGE: A formal quantitative measurement of cosmetic outcome after vacuum assisted excision for benign breast lesions was still lacking. This study shows that this cosmetic outcome is overall good in benign lesions up to 5 cm.


Asunto(s)
Neoplasias de la Mama/cirugía , Estética , Medición de Resultados Informados por el Paciente , Adulto , Anciano , Biopsia con Aguja Gruesa , Neoplasias de la Mama/patología , Estudios Transversales , Femenino , Humanos , Persona de Mediana Edad , Países Bajos , Vacio
16.
Front Cell Dev Biol ; 8: 337, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32596234

RESUMEN

Here, biophysical properties of membranes enriched in three metabolically related sterols are analyzed both in vitro and in vivo. Unlike cholesterol and ergosterol, the common metabolic precursor zymosterol is unable to induce the formation of a liquid ordered (l o) phase in model lipid membranes and can easily accommodate in a gel phase. As a result, Zym has a marginal ability to modulate the passive membrane permeability of lipid vesicles with different compositions, contrary to cholesterol and ergosterol. Using fluorescence-lifetime imaging microscopy of an aminostyryl dye in living mammalian and yeast cells we established a close parallel between sterol-dependent membrane biophysical properties in vivo and in vitro. This approach unraveled fundamental differences in yeast and mammalian plasma membrane organization. It is often suggested that, in eukaryotes, areas that are sterol-enriched are also rich in sphingolipids, constituting highly ordered membrane regions. Our results support that while cholesterol is able to interact with saturated lipids, ergosterol seems to interact preferentially with monounsaturated phosphatidylcholines. Taken together, we show that different eukaryotic kingdoms developed unique solutions for the formation of a sterol-rich plasma membrane, a common evolutionary trait that accounts for sterol structural diversity.

17.
Brachytherapy ; 18(2): 204-210, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-30528494

RESUMEN

PURPOSE: Accelerated partial breast irradiation is a treatment option for selected patients with early-stage breast cancer. Some accelerated partial breast irradiation techniques lead to skin toxicity with the skin dose as a main risk factor. Biodegradable spacers are effective and safe in prostate brachytherapy to protect the rectum. We hypothesize that a subcutaneous spacer injection reduces the skin dose in breast brachytherapy. METHODS AND MATERIALS: Ultrasound-guided spacer injections, either hyaluronic acid (HA) or iodined polyethylene glycol (PEG), were performed on fresh mastectomy specimens. Success was defined as a spacer thickness of ≥5 mm in the high-dose skin area. Usability was scored using the system usability scale. Pre and postinjection CT scans were used to generate low-dose-rate seed brachytherapy treatment plans after defining a clinical target volume. Maximum dose to small skin volumes (D0.2cc) and existence of hotspots (isodose ≥90% on 1 cm2 of skin) were calculated as skin toxicity indicators. RESULTS: We collected 22 mastectomy specimens; half had HA and half had PEG injection. Intervention success was 100% for HA and 90.9% for PEG (p = NS). Hydrodissection was feasible in 81.8% with HA and 63.6% with PEG. Median system usability scale score was 97.5 for HA and 82.5 for PEG (p < 0.001). Mean D0.2cc was 80.8 Gy without spacer and 53.7 Gy with spacer (p < 0.001). Skin hotspots were present in 40.9% without spacer but none with spacer (p < 0.001). CONCLUSIONS: A spacer injection in mastectomy specimens is feasible. An extra 5 mm space is always achieved, thereby potentially reducing the skin dose dramatically in low-dose-rate seed breast brachytherapy.


Asunto(s)
Braquiterapia/métodos , Neoplasias de la Mama/radioterapia , Ácido Hialurónico/administración & dosificación , Polietilenglicoles/administración & dosificación , Sustancias Protectoras/administración & dosificación , Radiodermatitis/prevención & control , Braquiterapia/efectos adversos , Femenino , Humanos , Inyecciones , Mastectomía , Proyectos Piloto , Dosis de Radiación , Radiodermatitis/etiología , Piel/efectos de la radiación
18.
Radiother Oncol ; 131: 8-13, 2019 02.
Artículo en Inglés | MEDLINE | ID: mdl-30773191

RESUMEN

BACKGROUND AND PURPOSE: During oncoplastic breast-conserving surgery (BCS), the surgical cavity is closed to reduce seroma formation. This makes the radiotherapy target definition using clips challenging, leading to poor inter-observer agreement and potentially geographical misses. We hypothesize that injecting a radiopaque hydrogel in the lumpectomy cavity before closure improves radiotherapy target definition and agreement between observers. MATERIALS AND METHODS: Women undergoing BCS in a single university hospital were prospectively accrued in the study. Three to 9 ml of iodined PolyEthylene Glycol (PEG) hydrogel and clips were inserted in the lumpectomy cavity. A CT-scan was performed at 4 to 6 weeks. CT images of BCS patients with standard clips only were used as control group, matched on age, specimen weight, and distance between clips. Six radiation oncologists delineated the tumor bed volumes and rated the cavity visualization scores (CVS). The primary endpoint was the agreement between observers measured using a Conformity Index (Cx). RESULTS: Forty-two patients were included, 21 hydrogel procedures and 21 controls, resulting in 315 observer pairs. The feasibility of the intervention was 100%. The median Cx was higher in the intervention group (Cx = 0.70, IQR [0.54-0.79]) than in the control group (Cx = 0.54, IQR [0.42-0.66]), p < 0.00, as were the CVS (3.5 [2.5-4.5] versus 2.5 [2-3.5], p < 0.001). The rate of surgical site infections was similar to literature. CONCLUSIONS: The use of radiopaque PEG enables to identify the lumpectomy cavity, resulting in a high inter-observer agreement for radiotherapy target definition. This intervention is easy to perform and blend well into current practice.


Asunto(s)
Neoplasias de la Mama/diagnóstico por imagen , Neoplasias de la Mama/radioterapia , Hidrogeles/administración & dosificación , Planificación de la Radioterapia Asistida por Computador/métodos , Anciano , Neoplasias de la Mama/cirugía , Femenino , Humanos , Mastectomía Segmentaria/métodos , Persona de Mediana Edad , Estudios Prospectivos , Planificación de la Radioterapia Asistida por Computador/instrumentación , Radioterapia Adyuvante , Radioterapia Guiada por Imagen/métodos , Tomografía Computarizada por Rayos X/métodos
19.
PLoS One ; 13(5): e0195715, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-29791437

RESUMEN

BACKGROUND: The incidence of surgical site infections (SSIs) after breast cancer surgery is relatively high; ranging from 3 to 19%. The role of wound dressings in the prevention of SSI after breast cancer surgery is unclear. This study compares a silver carboxymethylcellulose dressing (AQUACEL Ag Surgical (Aquacel) with standard wound dressing in SSI rate after breast cancer surgery. PATIENTS AND METHODS: A single-centre randomized controlled trial among women ≥18 years, diagnosed with breast cancer, undergoing breast conserving or ablative surgery, was conducted in a combined in and outpatient setting. The intervention was the use of Aquacel, compared with standard gauze dressing. Primary outcome measure was SSI following CDC criteria. RESULTS: A total of 230 patients were analysed: 106 in the Aquacel group and 124 controls. Seven patients (6.6%) developed SSI in the Aquacel group and 16 patients (12.9%) in the control group (RR 0.51 [95% Confidence Interval (CI): 0.22-1.20]; p = 0.112; adjusted OR 0.49 [0.19-1.25] p = 0.135)). Unplanned exploratory subgroup analysis of breast conserving surgery patients showed that SSI rate was 1/56 (1.8%) in the Aquacel group vs. 7/65 (10.8%) in controls; adjusted OR 0.15 [0.02-1.31] p = 0.087. The Aquacel group showed better patient satisfaction (median 8 vs. 7 on a Numerical Rating Scale, p = 0.006), fewer dressing changes within 48 hours(adjusted OR 0.12 [0.05-0.27] p<0.001), fewer re-operations (0% vs. 3.2%, p = 0.062), and lower mean wound-related treatment costs, both in a high (€265.42 (SD = 908) vs. €470.65 (SD = 1223) [p<0.001]) and low (€59.12 (SD = 129) vs. €67.55 (SD = 172) [p<0.001]) attributable costs of SSI model. CONCLUSION: In this randomized controlled trial in women undergoing surgery for breast cancer, the use of AQUACEL Ag Surgical wound dressing did not significantly reduce the occurrence of SSIs compared to standard gauze dressing. The use of Aquacel resulted in significantly improved patient satisfaction, reduced dressing changes and reduced wound-related costs. TRIAL REGISTRATION: www.trialregister.nl: NTR5840.


Asunto(s)
Vendajes/microbiología , Neoplasias de la Mama/cirugía , Carboximetilcelulosa de Sodio/farmacología , Infección de la Herida Quirúrgica/prevención & control , Femenino , Humanos , Mastectomía/efectos adversos , Persona de Mediana Edad
20.
Genes (Basel) ; 9(1)2018 Jan 09.
Artículo en Inglés | MEDLINE | ID: mdl-29315242

RESUMEN

Nuclear Factor-kappa B (NF-κB) is a transcription factor family that regulates a large number of genes that are involved in important physiological processes, including survival, inflammation, and immune responses. More recently, constitutive expression of NF-κB has been associated with several types of cancer. In addition, microorganisms, such as viruses and bacteria, cooperate in the activation of NF-κB in tumors, confirming the multifactorial role of this transcription factor as a cancer driver. Recent reports have shown that the NF-κB signaling pathway should receive attention for the development of therapies. In addition to the direct effects of NF-κB in cancer cells, it might also impact immune cells that can both promote or prevent tumor development. Currently, with the rise of cancer immunotherapy, the link among immune cells, inflammation, and cancer is a major focus, and NF-κB could be an important regulator for the success of these therapies. This review discusses the contrasting roles of NF-κB as a regulator of pro- and antitumor processes and its potential as a therapeutic target.

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